This is bare-bones, original, primitive e-mail. Install opensmtpd (or similar), then ncat or nc or netcat (this mysterious cat has many names). Start the opensmtpd service, then use netcat to speak with the mail-daemon: 1nc localhost 25 The computer should respond with code 220, which means 'I am listening'. 220 hex …

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Set up a file like this, called troubleshooting.txt. [ Is there an IP address? ] -- no --> [ Check NIC driver, dmesg ] [ Is there an IP address? ] -- yes --> [ Can you ping the router? ] [ Can you ping the router? ] -- no --> [ Check cables, router, and switches ] [ Can you ping the router? ] -- yes --> [ Can you ping …

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Compose a statement for execution. 1x='echo $y' 2echo $x 3y=dragon 4eval "$x" The results remain in the current shell, unlike sub-shells. 1b=basilisk 2sh -c 'echo $b' 3eval "g=goblin" 4echo $g

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Find metadata: 1exiftool "$file".jpg Find info on all .png images in current directory. 1exiftool -ext .png . You can make this recurring with the -r switch. And overwrite all metadata: 1exiftool -all= -overwrite_original -ext jpg . (NB: This does not work on pdf data. See here for erasing all pdf data) Or just GPS …

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Monitor all processes: 1extrace Monitor one process: 1extrace ls Monitor a script: 1./script.sh | extrace

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SSH Daemon Jail 1sudo cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.d/ssh.local 1[sshd] 2enabled = true 3 4ignoreip = 127.0.0.1/8 ::1,192.168.0.0/16 ::1 1sudo systemctl restart fail2ban 1sudo fail2ban-client status 1sudo fail2ban-client status sshd

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Basics Add your user to the audio group, and install festival-english. 1echo "(Parameter.set 'Audio_Method 'Audio_Command)" >> /usr/share/festival/voices.scm 1echo "(Parameter.set 'Audio_Command "aplay -q -c 1 -t raw -f s16 -r $SR $FILE")" /usr/share/festival/voices.scm Set Default Voice Edit ~/.festivalrc with (set! …

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Basics Translate a media file to a new type. ffmpeg -i [input file] output_file.mkv The input file might be a device, such as a camera. Record screen Take the format as 'grab the x11 screen'. 1ffmpeg -f x11grab -s [screensize] -i :0.0 out.mkv Get screensize with 1xrandr -q or maybe just... 1ffmpeg -f x11grab -s …

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Search for the next and or previous occurrence of the word under your cursor with * and #. Search and replace the first 'one' found with 'two': :%s/one/two/ Run the last substitution globally: g& Same, but just replace 'one' globally: :%s/one/two/g Put quotes around every occurrence of $HOME: :%s/$HOME/"&" Same, but …

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Basics Update font-cache: 1su root 2fc-cache List fonts: 1fc-list Grab the part of the font name you need for Xresources: 1fc-list | cut -d: -f2 Add field 3 for styles.

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